Water Sort is an online game is a basic but interactive game. That tells you step by step what to do as well as gives me a short tutorial on how to play the game which I greatly appreciate. As you progress each level it gets more complex but with that they continue to give you step by step directions and tutorials. I enjoy that as you move on in the game it is a puzzle that is increasing more complex at an appropriate level. You are adding colors to these vials. Only the same colors can be added to each other. However it will not allow you to make the wrong color add. There are very cute sound effects.